| 摘要 |
PROBLEM TO BE SOLVED: To provide a battery power storage system wherein power conversion efficiency is enhanced and the cost is reduced without separately installing a dedicated initial charger. SOLUTION: In the battery power storage system, a power converter 4 can be connected to a system power supply 1 through a transformer 3 for linkage, and an electrolyte circulating secondary battery 6 which requires initial charging from 0 V of battery voltage can be connected to the direct current side of the power converter 4 through an electrolytic capacitor 15. The direct-current voltage of the electrolytic capacitor 15 is established at rectified voltage by the rectifying operation of the power converter 4, and further the electrolyte circulating secondary battery 6 is connected to the direct current side of the power converter 4. The battery power storage system is provided with a control circuit 16 which initially charges the electrolyte circulating secondary battery 6 under such control that the modulation factor of the power converter 4 is fixed at a value not more than 1, and the phase difference between the output voltage of the power converter 4 and the system voltage is fixed at a value not more than the rated power of the power converter 4. |
